walter westeup



PATENT carica.

WALTER WESTRUP, OF \VAPIING, ENGLAND.

canin-MILL.

speiacanon cf Letters Patent No. 11,011, dated June e, 1854.

To all whom it may concern:

Be it known that I, WALTER WEs'rRUP, of Wap-ping, in the county of Middlesex, England, miller and biscuit baker, a subject of the Queen of Great Britain, have yinvented or discovered new and useful Improvements in Grinding Corn or Grain; and I, the `said WALTER Wns'rnnr, do hereby declare that the nature of the `said invention and in what manner the same is to be performed are fully described and ascertained in and by the following statement thereof, reference being had to the drawings hereunto annexed and to the figures and letters marked thereon-that Vis to say:

My improvements in machinery for grinding corn or grain consist 1n 'making the running stones with conical grinding surfaces in place of fiat ones as is usually the case. In this improved arrangement the bottom stones are the runners, the upper stones being stationary and made in the form of a ring with inclined inner surfaces, so as to iit and as it were to surround the bottom stones or runne-rs. The runners ofboth pair of grinding stonesI are mounted one above the other on the same vertical shaft and are arranged in such a manner that the first pairs will break down the corn or grain and partially pulverize it. The meal then passes fro-m the first pair of stones into a kind of short dressing machine, where the fine flour is separated from the underground meal, which passes between the second pair of stones, where it is completely ground. By this means the corn is passed through the mill in much less time than usual and thereby an increased amount of work in a given time is effected. The grinding surfaces being conical, also facilitate the delivery of the flour therefrom and thus prevent it from being spoiled or damaged by heating from friction. j

The improved arrangement of apparatus for grinding corn or grain is shown in the drawings hereunto annexed. i

Figure 1 isa vertical section taken through the middle of the machine; Fig. 2, a plan or partial sectional view taken in the line 1, 2, of Fig. l, and Fig. 3 a `sectional plan View of the machine taken in the line 3, 4i, of Fig. 1.

In this` arrangement two pairs of stones are employed. The lower stones E, E, are the runners and are Xed one above the other on a hollow `vertical shaft F, which `turns in bearings made in the frame-work. The grinding .surface of the stones E, is conical or inclined and lateral holes are made in the stones from the eye to the grinding surface (as shown at Fig. 1 and also in the sectional plan view, Fig. 4) for the purpose of admitting air to the grinding Vsurface in order to keep it cool. To facilitate this operation the driving shaft F, is made hollowl and is supplied with air by-a pipe from above, the air being admitted to the eye of the stone by means of lateral holes communicating with the interior of the shaft. The top stones G, G, are stationary and are `of an annularshape,`their grinding surfaces being inclined to correspond `with the conical surface ofthe runner or bottom stone. For the convenience rof adjustment the upper stones are mounted in annular frames S, S, which are by means of projecting pieces 1, 1, 1, (see Figs.

2, 3, and 5) supported upon a stationaryledge 2, 2, 2, which is secured to the framing. The mode of mounting and adjusting the top'stone will be best understood `by referring to the detached view, Fig. 5, lwhich represents in elevation the parts in immediate connection with the stones. It will be seen upon referring to this figure that the parts of the ledge 2, 2, 2, upon which the projecting pieces 1, 1, 1, of the annular frames S, S, rest, are inclined, so that by merely turning the frame S, S', slightly around horizontally the stone may beV adjusted to the surface of the runner with the greatest nicety. In order to effect this adjustment a small toothed rack t, is made on the outside or periphery of the annular frame` S, S, and this rack gears into an endless screw u on one end of which is mounted a bevel pinion or miter-wheel. This wheel is driven by a similar pinion on the upper end of a vertical shaft lv, which is actuated by means of a similar pair of miter-wheels `and the hand-wheel w. The operation, mode of mount-ing, and adjustment of the lower pair of stones is precisely similar to the upper, and therefore no separate description is required.

The apparatus is fed with corn to be ground by the pipe H, and the feed is regulated by a sliding pipe or tube aa, which incloses the bottom of the feed pipe iand may be moved up and down by a lever y, the opposite extremity of which is jointed to a long rod e, threaded at its lower end and furnished with a hand-wheel Vand thumb-l screw, whereby the rod .e may be raised or lowered and the feed regulated at pleasure by bringing the lower edge of the sliding tube nearer to or farther from the circular plate 3, in the feed bX. The amount of feed having been properly adjusted by the means just described, the corn will pass down the pipe intothe feed boX, and from thence down the pipe 4, into the box 5, immediately above the eye of the upper stone. From this boX 5 the corn will pass between the grinding surfaces of the stones Gr, and E, and will be broken down and partially pulverized. The meal will quickly find its way out from between the stones and will fall down on to the conical inclined surface 6, 6, from whence it will pass into a wire cylinder I, I, in which a number of brushes 7, 7, similar to those of a dressing machine work. These brushes 7 7, are

mounted on the main shaft F, and rotate with it, and as the meal falls into the cyl-I inder they will brush the already pulverized flour through the fine meshes o'f the wire and allow it to fall down the inclined sur face 8, 8, into a -chamber J below (shown best at Fig. 5), while the partially ground meal will fall 'down the inclined surface 9, 9, and pass between the second pair of stones (as shown at Fig. l). By this second operation the meal will have become completely ground or softened down, and when it escapes from the second pair of stones it will fall into the chamber J, into which the flour from the previous grinding operation has already fallen. It will be understood that the object of separating the flour from the meal after the first grinding operation is that the flour already produced may not be allowed uselessly to pass through v the second pair of stones.

At the bottom of the chamber J, is a table K, which is mounted on the vertical drivvolving table K, is by the rotation of the latter brought against the arm 10, (see Figs. 5 and 6,) which sweeps it into the spout 1l, from whence it falls into a bin or receptable below. To the under side of the revolving table K, are attached a number of sweeps or curved arms (shown by dots at Fig. 6), whereby any meal that may get under the table is swept out into the spout 11, as the table K rotates.

It is almost unnecessary to state that the principal working parts are inclosed by a casing N, made of canvas or other suitable material, for the purpose of preventing the flour from being blown about.

Motion is communicated to the working parts by means of the bevel gearing shown at L, L, Fig. l, which is actuated by any prime mover.

What I claim as my invention and desire to secure by Lett-ers Patent of the United States is The general arrangement and combination of parts herein described-that is to say, the use of two or more pairs of mill stones, the runner of each pair being mounted on the same vertical shaft, and arranged in such manner that when the meal escapes from the first pair of stones it may be sub- 4jected to a dressing operation, for the purpose of separating the already formed flour from the unground meal, as set forth, leaving the unground-meal, when freed from the flour, to pass through the second pair of stones to perfect the grinding operation, substantially in the manner as herein described.

WALTER WESTRUP.

"Witnesses H. I. GASKILL,

ANDW. WALKER. 

